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Bug 986728 - Engage frecency decay time experiment for HTTP cache v2, r=jduell

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This commit is contained in:
Honza Bambas 2014-04-04 14:42:06 +02:00
parent f5a29a69e0
commit ccb03c457d
2 changed files with 19 additions and 4 deletions
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4
browser/app/profile/firefox.js
View File

@ -1415,6 +1415,10 @@ pref("ui.key.menuAccessKeyFocuses", true);
// Delete HTTP cache v2 data of users that didn't opt-in manually
pref("browser.cache.auto_delete_cache_version", 1);
// Play with different values of the decay time and get telemetry,
// 0 means to randomize (and persist) the experiment value in users' profiles,
// -1 means no experiment is run and we use the preferred value for frecency (6h)
pref("browser.cache.frecency_experiment", 0);
// Telemetry experiments settings.
pref("experiments.enabled", false);

19
netwerk/cache2/CacheObserver.cpp
View File

@ -134,15 +134,26 @@ CacheObserver::AttachToPreferences()
"browser.cache.disk.parent_directory", NS_GET_IID(nsIFile),
getter_AddRefs(mCacheParentDirectoryOverride));
sHalfLifeExperiment = mozilla::Preferences::GetInt(
// First check the default value. If it is at -1, the experient
// is turned off. If it is at 0, then use the user pref value
// instead.
sHalfLifeExperiment = mozilla::Preferences::GetDefaultInt(
"browser.cache.frecency_experiment", kDefaultHalfLifeExperiment);
if (sHalfLifeExperiment == 0) {
// The experiment has not yet been initialized, do it now
// Store the experiemnt value, since we need it not to change between
// browser sessions.
// Default preferences indicate we want to run the experiment,
// hence read the user value.
sHalfLifeExperiment = mozilla::Preferences::GetInt(
"browser.cache.frecency_experiment", sHalfLifeExperiment);
}
if (sHalfLifeExperiment == 0) {
// The experiment has not yet been initialized but is engaged, do
// the initialization now.
srand(time(NULL));
sHalfLifeExperiment = (rand() % 4) + 1;
// Store the experiemnt value, since we need it not to change between
// browser sessions.
mozilla::Preferences::SetInt(
"browser.cache.frecency_experiment", sHalfLifeExperiment);
}